WMR OpenXR is a bit iffy in respect to whether the headset is initialized before or after the first game frame. I have made some changes to the init sequence recently, hopefully that will help with the matter.
If you still exeperience this issue after the next update, let me know again.
That said: With literally thousands of games there always is a chance that for one or the other you will have to resort to SteamVR instead of OpenXR for WMR headsets. Can’t entirely rule that out even with the aforementioned changes in the next vorpX version.